Rotor Active “Anti-Swirl” Control

Muszynska, A.; Franklin, W. D.; Bently, Donald E.

doi:10.1115/1.3269491

Cited by 14 publications

(13 citation statements)

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“…(15) can be obtained by several different approaches. The approach used in this study will be through the principle of optimality, and the state feedback control that minimizes the performance index, J N , is found, which follows a standard approach developed by Bellman [11,12]. The solution is…”

Section: Linear Quadratic Regulator (Lqr)mentioning

confidence: 99%

“…Cheng and Rowe [10] presented a selection strategy for the design of externally pressurized journal bearings. Muszynska et al [11] developed an anti-swirl to reduce or eliminate rotor self-excited vibrations due to fluid interaction by controlling fluid circumferential velocity. Muszynska and Bently [12] proposed that the anti-swirl concept is based on the injection of an additional flow to the seal, in tangential direction, opposite to the direction of the shaft rotation.…”

Section: Introductionmentioning

confidence: 99%

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Eliminating whirl occurrence in fluid-film bearings of rotary machinery through optimally controlled anti-swirl injection

Tsuei

Pan

2014

SPIE Proceedings

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The phenomenon of fluid-induced instability existing in fluid-film bearing systems has been coped with for long time.The study aims to soothe and even eliminate the occurrence of whirl in rotary machinery by increasing the threshold of instability through the anti-swirl injection using an optimal control based linear quadratic regulator. An acceptance region was established in order to decide starting up the control process. Some case studies were carried out to illustrate the effectiveness of the control scheme. The research results present that a simple control method incorporating with an acceptance region enables to avoid the fluid induced instability flexibly in rotary machinery. Moreover, the developed techniques can also be applied in other fluid-induced instability problems such as whip and rub, etc.

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Section: Linear Quadratic Regulator (Lqr)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Eliminating whirl occurrence in fluid-film bearings of rotary machinery through optimally controlled anti-swirl injection

Tsuei

Pan

2014

SPIE Proceedings

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“…However, this clearance reduction may lead to rotor/stator unilateral contacts and hazardous interaction phenomena [2,3]. In order to reduce the severity of such contact events, an abradable coating is often deposited along the casing contact surface as a sacrificial material [4][5][6]. A variety of works have been carried out on the numerical simulation of rotor/stator interactions taking into account abradable coating wear [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Rotor/Stator Interactions Accounting for Wear and Thermal Effects within Low- and High-Pressure Compressor Stages

Nyssen

Batailly

2020

Coatings

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In the current design of turbomachines, engine performance is improved by reducing the clearances between the rotating components and the stator, which allows for loss decrease. Due to these clearance reductions, contact events may occur between the rotor and the stator. An abradable coating is deposited along the stator circumference as a sacrificial material to lower the contact severity. However, experiments highlighted the occurrence of rotor/stator interactions with high wear depth on the abradable coating as well as high temperature increases within the abradable coating following contacts. This work focuses on the sensitivity analysis of rotor/stator interactions with respect to the rotor angular speed and the initial clearances between the rotor and the stator, taking into account thermal effects within the abradable coating. Convergence analyses are first conducted to validate the numerical model. Then, after a calibration of the thermal model of the abradable coating based on two experimental test cases, the numerical model is used to investigate the cross effects of the angular speed and the initial clearances on the obtained rotor/stator interactions.

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“…To reduce flow-induced force and improve the stability of seals, numerous seals have been designed in respect of different structures, which are regarded as two types of both anti-preswirl seal and damping seal. As for anti-preswirl seal, the anti-preswirl idea was developed by Muszynska in the 1980s [4]. e anti-preswirl seal can be divided into swirl brake seal and antiswirl seal.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated Seal

Sun

Wang²,

Fei

et al. 2019

Shock and Vibration

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Air-induced force generated in seals is one key factor on the stability of the rotor system. In this paper, a novel negative dislocated seal (NDS) was developed in respect of dislocated bearing theory, to reduce hydrodynamic pressure effect and air-induced force and improve rotor stability as well. A test rig was built to test rotordynamic characteristics and rotor stability of the NDS. The rotordynamic characteristics of seals were investigated based on the unbalanced synchronous excitation method, and seal-rotor system stability was evaluated by the identification method with an electromagnetic bearing exciter. The effects of both rotating speed and inlet/outlet pressure ratio on the rotordynamic characteristics and rotor stability of both NDS and conventional cylindrical labyrinth seal were experimentally investigated. The results show that with the increasing rotating speed, inlet/outlet pressure ratio is promising to reduce the direct stiffness coefficients of seals and the logarithmic decrement rate of seal-rotor system and enhance both cross stiffness and damping coefficient as well. Besides, the developed NDS effectively reduces cross-stiffness coefficients and increases direct damping coefficients and the logarithmic decrement rate of the seal-rotor system, relative to the conventional cylindrical seal. The proposed seal can effectively improve seal stability of turbomachinery.

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Rotor Active “Anti-Swirl” Control

Cited by 14 publications

References 0 publications

Eliminating whirl occurrence in fluid-film bearings of rotary machinery through optimally controlled anti-swirl injection

Eliminating whirl occurrence in fluid-film bearings of rotary machinery through optimally controlled anti-swirl injection

Sensitivity Analysis of Rotor/Stator Interactions Accounting for Wear and Thermal Effects within Low- and High-Pressure Compressor Stages

Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated Seal

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